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	<div id="winchm_template_title">!wdfkd.wdfdevext</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The <b>!wdfkd.wdfdevext</b> extension displays information that is associated with the <b>DeviceExtension</b> member of a Microsoft Windows Driver Model (WDM) DEVICE_OBJECT structure.</p>
<pre class="syntax"><b>!wdfkd.wdfdevext </b><i>DeviceExtension</i></pre>
<h2><a id="Parameters"></a><a id="parameters"></a><a id="PARAMETERS"></a>Parameters</h2>
<p></p>
<dl>
<dt><a id="_______DeviceExtension______"></a><a id="_______deviceextension______"></a><a id="_______DEVICEEXTENSION______"></a>       <i>DeviceExtension</i>      </dt>
<dd>
<p>A pointer to a device extension. </p>
</dd>
</dl>
<h3><a id="DLL"></a><a id="dll"></a>DLL</h3>
<p>
       Wdfkd.dll
      </p>
<h3><a id="Frameworks"></a><a id="frameworks"></a><a id="FRAMEWORKS"></a>Frameworks</h3>
<p>
       KMDF 1, UMDF 1, UMDF 2</p>
<h3><a id="Additional_Information"></a><a id="additional_information"></a><a id="ADDITIONAL_INFORMATION"></a>Additional Information</h3>
<p>For more information, see <a href="#Bookmark1419">Kernel-Mode Driver Framework Debugging</a>.</p>
<h2>Remarks</h2>
<p>Here is an example for HdAudBus.sys, which is a KMDF driver. Use <a href="#Bookmark2321"><b>!devnode</b></a> to find a device node that has HdAudBus as its function driver. Take the physical device object (PDO) from the output and pass it to <a href="#Bookmark2323"><b>!devstack</b></a>. Take the device extension address from the output of <b>!devstack</b> and pass it to <b>!wdfdevext</b>.</p>
<pre class="syntax" xml:space="preserve"><code>0: kd&gt; !devnode 0 1 hdaudbus
Dumping IopRootDeviceNode (= 0xffffe000002cfd30)
DevNode 0xffffe000009b7a50 for PDO 0xffffe00000226880
  InstancePath is "PCI\VEN_8086&amp;DEV_293E&amp;SUBSYS_2819103C&amp;REV_02\3&amp;33fd14ca&amp;0&amp;D8"
  ServiceName is "HDAudBus"
  ...
0: kd&gt; !devstack 0xffffe00000226880
  !DevObj           !DrvObj            !DevExt           ObjectName
  ffffe00001351e20  \Driver\HDAudBus   ffffe000009a3c00  
&gt; ffffe00000226880  \Driver\pci        ffffe000002269d0  NTPNP_PCI0009
!DevNode ffffe000009b7a50 :
  DeviceInst is "PCI\VEN_8086&amp;DEV_293E&amp;SUBSYS_2819103C&amp;REV_02\3&amp;33fd14ca&amp;0&amp;D8"
  ServiceName is "HDAudBus"
0: kd&gt; *
0: kd&gt; !wdfdevext ffffe000009a3c00
Device context is 0xffffe000009a3c00
    context:  dt 0xffffe000009a3c00 HDAudBus!HDAudioDeviceExtension (size is 0xa8 bytes)
    EvtCleanupCallback fffff80001f35950 HDAudBus!HdAudBusEvtDeviceCleanupCallback

!wdfdevice 0x00001fffff65c6e8                        
!wdfobject 0xffffe000009a3910</code></pre>
<p>Here is an example for Wudfrd.sys, which is the function driver for the kernel-mode portion of a UMDF 2 driver stack. Use <a href="#Bookmark2321"><b>!devnode</b></a> to find a device node that has Wudfrd as its function driver. Take the physical device object (PDO) from the output and pass it to <a href="#Bookmark2323"><b>!devstack</b></a>. Take the device extension address from the output of <b>!devstack</b> and pass it to <b>!wdfdevext</b>.</p>
<pre class="syntax" xml:space="preserve"><code>0: kd&gt; !devnode 0 1 wudfrd
Dumping IopRootDeviceNode (= 0xffffe000002cfd30)
DevNode 0xffffe00000a1e530 for PDO 0xffffe00000b15b00
  InstancePath is "ROOT\SAMPLE\0001"
  ServiceName is "WUDFRd"
  ...
0: kd&gt; !devstack 0xffffe00000b15b00
  !DevObj           !DrvObj            !DevExt           ObjectName
  ffffe00000c11040  \Driver\WUDFRd     ffffe00000c11190  
&gt; ffffe00000b15b00  \Driver\PnpManager 00000000  00000052
!DevNode ffffe00000a1e530 :
  DeviceInst is "ROOT\SAMPLE\0001"
  ServiceName is "WUDFRd"
0: kd&gt; *
0: kd&gt; !wdfdevext ffffe00000c11190
Device context is 0xffffe00000c11190
---------------------------------------------------------------
 UMDF Device Instances for this Redirector extension
---------------------------------------------------------------
  DriverManagerProcess: 0xffffe00003470500

  ImageName              Ver   DevStack           HostProcess        DeviceID      
  MyUmdf2Driver.dll      v2.0  0x000000a5a3ab5f70 0xffffe00000c32900  \Device\00000052</code></pre></div></div>	
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